I have water-based paints, if those work for you. Urethane paints are easier to apply to metal surfaces using a pressurized spray can but those are harder to find here. I can make the water based paints myself and you get the same high-quality finish however those take longer to dry. From 24 to 48 hours, give or take.

There's solid paints with no sparkle effects except the color and then there's metallic paints that create a sparkling and grainy effect. I like the use that one for my finish.